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libnvdimm, e820: Register all pmem resources 

There is currently a mismatch between the resources that will trigger
the e820_pmem driver to register/load and the resources that will
actually be surfaced as pmem ranges. register_e820_pmem() uses
walk_iomem_res_desc() which includes children and siblings. In contrast,
e820_pmem_probe() only considers top level resources. For example the
following resource tree results in the driver being loaded, but no
resources being registered:

    398000000000-39bfffffffff : PCI Bus 0000:ae
      39be00000000-39bf07ffffff : PCI Bus 0000:af
        39be00000000-39beffffffff : 0000:af:00.0
          39be10000000-39beffffffff : Persistent Memory (legacy)

Fix this up to allow definitions of "legacy" pmem ranges anywhere in
system-physical address space. Not that it is a recommended or safe to
define a pmem range in PCI space, but it is useful for debug /
experimentation, and the restriction on being a top-level resource was
arbitrary.

Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2018-06-02 11:43:39 -07:00
parent 3f46833df9
commit d76401ade0
2 changed files with 23 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
drivers/nvdimm/e820.c
View File

@ -38,12 +38,27 @@ static int e820_range_to_nid(resource_size_t addr)
}
#endif
static int e820_register_one(struct resource *res, void *data)
{
struct nd_region_desc ndr_desc;
struct nvdimm_bus *nvdimm_bus = data;
memset(&ndr_desc, 0, sizeof(ndr_desc));
ndr_desc.res = res;
ndr_desc.attr_groups = e820_pmem_region_attribute_groups;
ndr_desc.numa_node = e820_range_to_nid(res->start);
set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc))
return -ENXIO;
return 0;
}
static int e820_pmem_probe(struct platform_device *pdev)
{
static struct nvdimm_bus_descriptor nd_desc;
struct device *dev = &pdev->dev;
struct nvdimm_bus *nvdimm_bus;
struct resource *p;
int rc = -ENXIO;
nd_desc.attr_groups = e820_pmem_attribute_groups;
nd_desc.provider_name = "e820";
@ -53,27 +68,15 @@ static int e820_pmem_probe(struct platform_device *pdev)
goto err;
platform_set_drvdata(pdev, nvdimm_bus);
for (p = iomem_resource.child; p ; p = p->sibling) {
struct nd_region_desc ndr_desc;
if (p->desc != IORES_DESC_PERSISTENT_MEMORY_LEGACY)
continue;
memset(&ndr_desc, 0, sizeof(ndr_desc));
ndr_desc.res = p;
ndr_desc.attr_groups = e820_pmem_region_attribute_groups;
ndr_desc.numa_node = e820_range_to_nid(p->start);
set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc))
goto err;
}
rc = walk_iomem_res_desc(IORES_DESC_PERSISTENT_MEMORY_LEGACY,
IORESOURCE_MEM, 0, -1, nvdimm_bus, e820_register_one);
if (rc)
goto err;
return 0;
err:
err:
nvdimm_bus_unregister(nvdimm_bus);
dev_err(dev, "failed to register legacy persistent memory ranges\n");
return -ENXIO;
return rc;
}
static struct platform_driver e820_pmem_driver = {

1
kernel/resource.c
View File

@ -448,6 +448,7 @@ int walk_iomem_res_desc(unsigned long desc, unsigned long flags, u64 start,
return __walk_iomem_res_desc(&res, desc, false, arg, func);
}
EXPORT_SYMBOL_GPL(walk_iomem_res_desc);
/*
* This function calls the @func callback against all memory ranges of type